<template>
  <div class="xtx-numbox">
    <div class="label" v-if="$slots.default"><slot/></div>
    <div class="numbox">
      <a @click="changeNum(-1)" href="javascript:;">-</a>
      <input type="text" readonly :value="modelValue">
      <a @click="changeNum(1)" href="javascript:;">+</a>
    </div>
  </div>
</template>
<script setup>
import { useVModel } from '@vueuse/core'

const props = defineProps({
  modelValue: {
    type: Number,
    default: 1
  },
  // 继续暴露两个属性，最小值和最大值
  min: {
    type: Number,
    default: 1
  },
  max: {
    type: Number,
    default: 10
  }
})
const emit = defineEmits(['update:modelValue', 'change'])
// 使用vueuse的方法useVModel方法
// 此时count就是响应式数据，修改count就会通知父组件
const count = useVModel(props, 'modelValue', emit)
const changeNum = (step) => {
// 判断修改后值是否合法
  const newVal = count.value + step
  if (newVal < props.min || newVal > props.max) return
  count.value = newVal
  // 暴露一个变化事件提醒父组件
  emit('change', newVal)
}
</script>

<script>
export default {
  name: 'XtxNumbox'
}
</script>
<style scoped lang="less">
.xtx-numbox {
  display: flex;
  align-items: center;

  .label {
    width: 60px;
    color: #999;
    padding-left: 10px;
  }

  .numbox {
    width: 120px;
    height: 30px;
    border: 1px solid #e4e4e4;
    display: flex;

    >a {
      width: 29px;
      line-height: 28px;
      text-align: center;
      background: #f8f8f8;
      font-size: 16px;
      color: #666;

      &:first-of-type {
        border-right: 1px solid #e4e4e4;
      }

      &:last-of-type {
        border-left: 1px solid #e4e4e4;
      }
    }

    >input {
      width: 60px;
      padding: 0 5px;
      text-align: center;
      color: #666;
    }
  }
}
</style>
